JP7221197B2 - sealing device - Google Patents

Description

The present invention relates to a sealing device for sealing between a shaft and a hole into which the shaft is inserted.

2. Description of the Related Art In vehicles, general-purpose machines, etc., a sealing device has been conventionally used to seal between a shaft and a hole into which the shaft is inserted in order to prevent leakage of an object to be sealed, such as lubricating oil. . In such a sealing device, sealing between the shaft and the sealing device is achieved by bringing the seal lip into contact with the shaft or with an annular member attached to the shaft. The contact of this seal lip with the shaft for sealing also serves as sliding resistance (torque resistance) to the shaft. In recent years, due to the demand for low fuel consumption of vehicles, sealing devices are required to reduce the sliding resistance against the shaft. Structure is required.

Although increasing the number of seal lips is conceivable for improving the sealing performance of the sealing device, increasing the number of seal lips increases the sliding resistance. On the other hand, instead of sealing by increasing the number of seal lips, there is a structure in which a threaded structure is provided on the seal lip or an annular member attached to the shaft, and the pump action of this threaded structure improves the sealing performance of the sealing device. (See Patent Documents 1 and 2, for example).

Japanese Patent No. 5637172 WO2015/190450

In the conventional sealing device using such a pumping action, it is possible to reduce the sliding resistance while improving the sealing performance. However, in a so-called end face seal type sealing device in which the seal lip contacts the flange surface of the slinger fixed to the shaft, which is a conventional sealing device utilizing such a pumping action, when the rotational speed of the shaft increases, The object to be sealed may leak out to the outside.

As described above, in the conventional sealing device utilizing the pump action, there is a demand for a structure in which the sealed object does not seep out even when the rotation speed of the shaft becomes high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to suppress seepage of an object to be sealed regardless of the rotational speed of the shaft even when the pump action is used. To provide a sealing device capable of

To achieve the above object, a sealing device according to the present invention is a sealing device for sealing an annular gap between a shaft and a hole into which the shaft is inserted, wherein the sealing device is fitted into the hole. and a slinger attached to the shaft, wherein the sealing device body is formed of an annular reinforcing ring around an axis and an elastic body attached to the reinforcing ring. The slinger has a flange portion which is an annular portion around the axis extending toward the outer peripheral side, and the elastic body has one side in the axial direction. extending toward the other side of the flange portion of the slinger. is formed with at least one groove, a plurality of radial projections are formed in the circumferential direction on the inner peripheral surface of the end face lip, and at least one circumferential projection is formed. and the radial projection spirally extends from the other side toward the one side in the direction of rotation of the shaft, and is a portion of the end face lip where the end face lip contacts the slinger. formed on the inner peripheral side of the slinger contact portion, the circumferential projection extends around the axis on the other side of the one side end of the radial projection, and The slinger contact portion protrudes from the end face lip on the other side in the axial direction.

In a sealing device according to an aspect of the present invention, the circumferential protrusion forms a gap with a side surface of at least one radial protrusion facing away from the rotation direction of the shaft.

In a sealing device according to an aspect of the present invention, the circumferential projection is provided on the other side of the pump area of the sealing device.

In a sealing device according to an aspect of the present invention, the radial projection is formed on the end face lip at a distance from the slinger contact portion.

In a sealing device according to an aspect of the present invention, the radial protrusion is formed at the distance from the slinger contact portion so as to extend from the return region to the pump region of the sealing device.

In the sealing device according to one aspect of the present invention, the groove formed in the slinger is a screw groove.

According to the sealing device of the present invention, it is possible to suppress seepage of the sealed object regardless of the rotational speed of the shaft even when the pump action is used.

1 is a cross-sectional view taken along an axis x for showing a schematic configuration of a sealing device according to a first embodiment of the present invention; FIG. 1 is a partially enlarged cross-sectional view showing an enlarged part of a cross section along an axis of a sealing device according to a first embodiment of the present invention; FIG. FIG. 2 is a partially enlarged perspective view of an elastic body portion in the sealing device shown in FIG. 1 , showing a state in which the elastic body portion in the portion on the inner peripheral side from the base portion is cut along the plane along the axis. 2 is a view of the slinger in the sealing device shown in FIG. 1 as seen from the outside; FIG. 1 is a partially enlarged cross-sectional view of a sealing device according to a first embodiment of the present invention, in use, in which the sealing device is attached to a housing and a shaft inserted into a shaft hole; FIG. FIG. 5 is a diagram showing how the sealed object flows due to the action of the radial projections and the circumferential projections of the end face lip in the sealing device according to the first embodiment of the present invention; FIG. 6 is a partially enlarged perspective view of an elastic body portion in a sealing device according to a second embodiment of the present invention, showing a state in which the elastic body portion in a portion on the inner peripheral side from the base portion is cut along a plane along the axis; ing. FIG. 10 is a diagram showing how the sealing object flows due to the action of the radial projections and the circumferential projections of the end face lip in the sealing device according to the second embodiment of the present invention; FIG. 11 is a cross-sectional view along the axis for showing the schematic configuration of a sealing device according to a third embodiment of the present invention; It is a partial expanded sectional view which expands and shows a part of cross section along an axis line of the sealing device which concerns on the 3rd Embodiment of this invention. It is the perspective view which looked at the sealing device main body of the sealing device which concerns on the 3rd Embodiment of this invention from the inside. FIG. 12 is a partial perspective view of the closure body showing a cross section along line AA of FIG. 11; FIG. 10 is a partially enlarged cross-sectional view of the sealing device shown in FIG. 9 in a use state in which the sealing device according to the third embodiment of the present invention is attached to a housing and a shaft inserted into a shaft hole; It is a figure which shows the modification of the sealing device which concerns on the 1st Embodiment of this invention. It is a figure which shows the modification of the sealing device which concerns on the 2nd Embodiment of this invention. It is a figure which shows the modification of the sealing device which concerns on the 3rd Embodiment of this invention. 17A and 17B are diagrams showing a modification of the groove of the slinger in the sealing device, FIG. 17(a) showing a modification of the groove, and FIG. 17(b) showing another modification of the groove;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view along the axis x for showing the schematic configuration of a sealing device 1 according to the first embodiment of the present invention, and FIG. It is a partially enlarged cross-sectional view showing an enlarged part of the cross section along the axis x of the sealing device 1 concerned. A sealing device 1 according to the present embodiment is a sealing device for sealing an annular gap between a shaft and a hole into which the shaft is inserted. It is used to seal between the hole (shaft hole) into which this shaft is inserted. For example, it is used to seal an annular space between a crankshaft of an engine and a crankhole which is an axial hole formed in a front cover, a cylinder block and a crankcase. In addition, the target to which the sealing device 1 according to the first embodiment of the present invention is applied is not limited to the above.

Hereinafter, for convenience of explanation, the arrow a (see FIG. 1) direction (one side in the axial direction) in the direction of the axis x is defined as the inside, and the direction of the arrow b (see FIG. 1) in the direction of the axis x (the other side in the axial direction) outside. More specifically, the inside is the side of the space to be sealed (the side of the object to be sealed) and is the side of the space where the object to be sealed such as lubricating oil exists, and the outside is the side opposite to the inside. . In a direction perpendicular to the axis x (hereinafter also referred to as “radial direction”), the direction away from the axis x (the direction of arrow c in FIG. 1) is defined as the outer peripheral side, and the direction approaching the axis x (arrow d in FIG. 1) direction) is the inner circumference side.

As shown in FIG. 1, the sealing device 1 includes a sealing device main body 2 fitted into a hole as an attachment target described later, and a slinger 3 attached to a shaft as an attachment target described later. The sealing device main body 2 includes a ring-shaped reinforcing ring 10 around the axis x and an elastic body portion 20 formed of an elastic body attached to the reinforcing ring 10 and ring-shaped around the axis x. The slinger 3 has a flange portion 31 which is an annular portion around an axis x extending toward the outer circumference (in the direction of arrow c). The elastic body portion 20 extends toward one side (inner side, arrow a direction) in the direction of the axis x and contacts the flange portion 31 from the other side (outer side, arrow b direction) in the axial direction x around the axis x. It has an end face lip 21 which is an annular lip.

At least one groove 33 is formed on the other side (outside) of the flange portion 31 of the slinger 3, and a plurality of radial projections are formed on the inner peripheral surface (inner peripheral surface 22) of the end face lip 21. 23 are formed side by side in the circumferential direction, and at least one circumferential projection 24 is formed.

As will be described later, the radial projection 23 spirally extends from the other side (outer side) toward the one side (inner side) in the rotation direction of the shaft (slinger 3 ) described later, and extends at the end face lip 21 toward the end face. The lip 21 is formed on the inner peripheral side of the slinger contact portion 22a, which is the portion that contacts the slinger 3. As shown in FIG.

As will be described later, the circumferential projection 24 extends around the axis x on the other side (outside) of one side (inner) end (inner end 23a) of the radial projection 23 (described later). 3), and protrudes from the end face lip 21 on the other side in the direction of the axis x than the slinger contact portion 22a.

Each configuration of the sealing device main body 2 and the slinger 3 of the sealing device 1 will be specifically described below.

The reinforcing ring 10 in the sealing device body 2 is, as shown in FIGS. It is formed to fit and fit together. The reinforcing ring 10 includes, for example, a cylindrical portion 11 which is a cylindrical portion located on the outer peripheral side, a disc portion 12 which is a hollow disc-shaped portion extending from the outer end of the cylindrical portion 11 to the inner peripheral side, and a disc. A conical ring portion 13, which is a conical tubular annular portion extending inwardly and inwardly from the inner peripheral end of the portion 12, and a conical ring portion 13 extending from the inner or inner peripheral end of the conical ring portion 13 to the inner peripheral side. It has a disk portion 14 which is a hollow disk-shaped portion extending in the radial direction and reaching the end portion on the inner peripheral side of the reinforcing ring 10 . More specifically, the cylindrical portion 11 of the reinforcing ring 10 has an outer cylindrical portion 11a, which is a cylindrical or substantially cylindrical portion located on the outer peripheral side, and an outer cylindrical portion 11a on the outer and inner peripheral sides of the outer cylindrical portion 11a. It has an inner cylindrical portion 11b, which is an extending cylindrical or substantially cylindrical portion, and a connecting portion 11c, which is a portion connecting the outer cylindrical portion 11a and the inner cylindrical portion 11b. The outer cylindrical portion 11a of the cylindrical portion 11 is formed so that the axis x of the sealing device body 2 and the axis of the shaft hole 101 are aligned when the sealing device body 2 is fitted into a shaft hole of a housing described later. , it is fitted into the shaft hole 101 . An elastic body portion 20 is attached to the reinforcement ring 10 from substantially the outer peripheral side and the outside thereof to reinforce the elastic body portion 20 .

As shown in FIGS. 1 and 2, the elastic body portion 20 includes a base portion 25 attached to the end portion of the inner peripheral side of the disk portion 14 of the reinforcing ring 10, and the tubular portion 11 of the reinforcing ring 10. and a rear cover portion 27 which is a portion attached to the reinforcing ring 10 from the outside between the base portion 25 and the gasket portion 26. . More specifically, the gasket portion 26 is attached to the inner cylindrical portion 11b of the cylindrical portion 11 of the reinforcing ring 10, as shown in FIG. Moreover, the outer diameter of the gasket portion 26 is larger than the diameter of the inner peripheral surface (see FIG. 5) of the shaft hole, which will be described later. Therefore, when the sealing device main body 2 is fitted in a shaft hole, which will be described later, the gasket portion 26 is radially compressed between the inner cylindrical portion 11b of the reinforcing ring 10 and the shaft hole. The space between the reinforcing ring 10 and the inner cylindrical portion 11b is sealed. Thereby, the space between the sealing device main body 2 and the shaft hole is sealed. The outer diameter of the gasket portion 26 does not have to be larger than the diameter of the inner peripheral surface of the shaft hole over the entire axis x direction, and the outer diameter of the gasket portion 26 is larger than the diameter of the inner peripheral surface of the shaft hole in part. It may be. For example, an annular projection having a tip diameter larger than the diameter of the inner peripheral surface of the shaft hole may be formed on the outer peripheral surface of the gasket portion 26 .

In addition, in the elastic body portion 20, the end face lip 21 extends inwardly (in the direction of the arrow a) from the base portion 25 in an annular shape with the axis x as the center or approximately the center, so that the sealing device 1 can be mounted in a desired position. When the sealing device 1, which will be described later, is attached to the position and in use, the tip portion is formed so as to come into contact with the flange portion 31 of the slinger 3 from the outside with a predetermined interference (slinger contact portion 22a). The end face lip 21 has, for example, a conical tubular shape whose diameter increases toward the inner side (arrow a direction) in the direction of the axis x. That is, as shown in FIGS. 1 and 2, the end face lip 21 extends diagonally from the base portion 25 inwardly and outwardly from the base portion 25 in a cross section along the axis x (hereinafter also simply referred to as a cross section). ing. A plurality of radial protrusions 23 and at least one circumferential protrusion 24 are provided on the inner peripheral surface 22 of the end face lip 21 . Details of the radial projections 23 and the circumferential projections 24 will be described later.

The elastic body portion 20 also has a dust lip 28 and an intermediate lip 29 . The dust lip 28 is a lip extending from the base portion 25 toward the axis x, and extends annularly from the base portion 25 with the axis x as the center or approximately the center. is formed to contact the slinger 3 from the outer peripheral side with a predetermined interference. The dust lip 28 has, for example, a conical tubular shape whose diameter decreases toward the outside (in the direction of the arrow b) in the direction of the axis x. The dust lip 28 prevents foreign matter such as dust and moisture from entering the sealing device 1 from the outside, which is the side opposite to the side of the object to be sealed, during use. The dust lip 28 may be formed so as not to come into contact with the slinger 3 when the sealing device 1 is in use.

As shown in FIG. 2, the intermediate lip 29 is a lip extending inward from the base portion 25 with a substantially L-shaped cross section, and extends from the base portion 25 in an annular shape centered or substantially centered on the axis x. An annular recess opening toward the inside is formed between the base portion 25 and the base portion 25 . The intermediate lip 29 is not in contact with the slinger 3 when the sealing device 1 is in use, which will be described later. The intermediate lip 29 is designed so that when an object to be sealed seeps into the interior beyond the slinger contact portion 22a of the end face lip 21 that contacts the slinger 3, the infiltrated object to be sealed and the base portion 25 are separated. It is formed for accommodation in a recess formed therebetween. The intermediate lip 29, as shown in FIGS. 9 and 10, which will be described later, may have a conical tubular shape whose diameter decreases toward the inside in the direction of the axis x. The intermediate lip 29 may be configured to contact the slinger 3 when the closure 1 is in use.

Next, the shape of the end face lip 21 will be described in more detail. FIG. 3 is a partially enlarged perspective view of the elastic body portion 20 seen from the inner peripheral side, and shows a state in which the elastic body portion 20 in the portion on the inner peripheral side from the base portion 25 is cut in a plane along the axis x. ing. As shown in FIG. 3, on the inner peripheral surface 22 of the end face lip 21, a plurality of radial projections 23 are arranged on the same or substantially the same circumference at equal angular intervals or approximately equal angular intervals in the circumferential direction. They are arranged at equal pitch intervals or approximately equal pitch intervals. As described above, each radial projection 23 spirally extends from the outer side (lower side in FIG. 3) to the inner side (upper side in FIG. 3) in the rotation direction of the shaft (slinger 3) described later. That is, each radial projection 23 extends from the root 21b side of the end face lip 21 toward the tip end 21a side of the end face lip 21 while being inclined or curved in the rotational direction of the slinger 3 . Each radial projection 23 is spaced apart from the slinger contact portion 22a, and is located on the inner peripheral side (outside) of the slinger contact portion 22a. formed on the side of

In the end face lip 21, the radial protrusion 23 is formed spaced apart from the slinger contact portion 22a. Specifically, as shown in FIG. 3, an inner end 23a that is an inner (peripheral) end of the radial projection 23 is an outer edge that is an outer (peripheral) edge of the slinger contact portion 22a. 22b in the direction along the axis x along the inner peripheral surface 22 at a predetermined interval G. As shown in FIG. This interval G is such that the radial projections 23 are at least partially formed in a region on the inner peripheral side of a region (pump region) where a pumping action based on the grooves 33 of the slinger 3 is generated when the sealing device 1 is used, which will be described later. Intervals as they exist.

Further, as shown in FIG. 2, each radial projection 23 is shaped so as not to come into contact with the slinger 3 when the sealing device 1 is in use. That is, the height of the radial protrusion 23 from the inner peripheral surface 22 and the interval G are set so that the radial protrusion 23 does not contact the outer surface of the flange portion 31 of the slinger 3 in use. In this embodiment, as shown in FIGS. 2 and 3, the radial protrusion 23 extends from the inner peripheral surface 22 toward the outer end 23b, which is the end portion of the end face lip 21 on the root 21b side, from the inner end 23a. Although the height is high, the height of the radial protrusion 23 from the inner peripheral surface 22 is not limited to this. The radial projections 23 may have a constant height from the inner peripheral surface 22 from the inner end 23a to the outer end 23b, and the height from the inner peripheral surface 22 from the inner end 23a to the outer end 23b may be It may be low. Moreover, the radial protrusion 23 may have various combinations of the above-described increasing, decreasing, and constant height from the inner peripheral surface 22 from the inner end 23a to the outer end 23b. Moreover, the shape of the cross section perpendicular to the extending direction of the radial projection 23 may be various shapes, such as a triangular shape, a quadrangular shape, and an inverted U shape. Since the radial protrusions 23 are shaped so as not to come into contact with the slinger 3 when the sealing device 1 is in use, the radial protrusions 23 do not increase the sliding resistance to the slinger 3 .

Moreover, as shown in FIG. 3, the radial projection 23 may be tapered from the outer end 23b toward the inner end 23a. It may be a shape in which the width in the direction perpendicular to the extending direction is constant over the entire length, or may be various shapes. Moreover, the protrusion 23 may extend straight between the inner end 23a and the outer end 23b, or may extend curvedly.

As shown in FIG. 3, the inner peripheral surface 22 of the end face lip 21 is provided with at least one circumferential projection 24 on the same or substantially the same circumference around the axis x. . In this embodiment, one circumferential protrusion 24 is provided on the end face lip 21 . As described above, the circumferential projection 24 extends around the axis x outside the inner end 23a of the radial projection 23 (on the root 21b side of the end face lip 21). In the present embodiment, the circumferential projection 24 is provided on the other side (outer side or inner peripheral side) than a pump region (to be described later) in the sealing device 1 . The circumferential protrusions 24 are preferably provided in a reflux region, which will be described later.

1 and 2, the circumferential projection 24 protrudes from the end face lip 21 in a region outside the slinger contact portion 22a in the direction of the axis x, and the inner end of the circumferential projection 24 The tip 24a, which is the portion, is located outside the slinger contact portion 22a in the direction of the axis x. As described above, the circumferential projection 24 is formed in such a shape that it does not come into contact with the slinger 3 when the sealing device 1 is used.

In addition, as shown in FIG. 2, the circumferential projection 24 protrudes further inward than the radial projection 23 in the direction of the axis x. The circumferential projection 24 does not have to protrude further inward than the radial projection 23 in the axis x direction. It may be the same as the amount. Moreover, the shape of the cross section (see FIG. 2) perpendicular to the extending direction of the circumferential projection 24 is not limited to a rectangle, and may be various shapes such as a triangle, a square, and an inverted U shape. The outer peripheral surface 24b, which is the surface facing the outer peripheral side of the circumferential projection 24, is preferably a surface facing the outer peripheral side at least when the sealing device 1 is in use, and is a surface extending along the axis x. Alternatively, it is preferably a surface that extends obliquely to the outer peripheral side with respect to the axis x that is inclined to the inner peripheral surface 22 side.

As described above, the elastic body portion 20 has the end face lip 21, the base portion 25, the gasket portion 26, the rear cover portion 27, the dust lip 28, and the intermediate lip 29, and each portion is integrated. , the elastic body portion 20 is integrally formed from the same material.

The reinforcing ring 10 described above is made of a metal material, such as stainless steel or SPCC (cold rolled steel). As the elastic body of the elastic body portion 20, for example, there are various rubber materials. Examples of various rubber materials include synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluorine rubber (FKM).

The reinforcing ring 10 is manufactured by, for example, pressing or forging, and the elastic body portion 20 is formed by bridging (vulcanization) forming using a forming die. At the time of this cross-linking molding, the reinforcing ring 10 is placed in a mold, the elastic body portion 20 is adhered to the reinforcing ring 10 by cross-linking adhesion, and the elastic body portion 20 and the reinforcing ring 10 are integrally molded. be done.

The slinger 3 is an annular member that is attached to a shaft when the sealing device 1 is used, which will be described later, and is an annular member centered or substantially centered on the axis x. The slinger 3 has a substantially L-shaped cross section, and includes a flange portion 31 and a cylindrical or substantially cylindrical cylindrical portion extending in the direction of the axis x and connected to the inner peripheral end of the flange portion 31. 34.

Specifically, the flange portion 31 has a hollow disk-shaped or substantially hollow disk-shaped inner peripheral side disk portion 31a extending in the radial direction from the cylindrical portion 34, and the inner peripheral side disk portion 31a widens on the outer peripheral side of the inner peripheral side disk portion 31a. A hollow disc-shaped or substantially hollow disc-shaped outer peripheral disc portion 31b extending in the radial direction connects the outer peripheral end of the inner peripheral disc portion 31a and the inner peripheral end of the outer peripheral disc portion 31b. and a connecting portion 31c. The outer disk portion 31b is located outside the inner disk portion 31a in the direction of the axis x. The shape of the flange portion 31 is not limited to the shape described above, and various shapes can be used depending on the application. For example, the flange portion 31 does not have the inner disk portion 31a and the connection portion 31c, and the outer disk portion 31b extends to the cylinder portion 34 and is connected to the cylinder portion 34. It may be a hollow disc-shaped or substantially hollow disc-shaped portion extending in the radial direction.

A lip contact portion 32, which is a portion where the slinger 3 contacts the end face lip 21, is positioned on the outer side surface 31d of the flange portion 31, which is the surface facing the outside of the outer peripheral disk portion 31b. The outer surface 31d is preferably a surface along a plane extending in the radial direction. Further, as shown in FIG. 4, the outer side surface 31d of the flange portion 31 is formed with a groove 33 by a concave portion recessed inward. The groove 33 is, for example, a screw groove. This groove 33 allows a pumping action to be generated when the slinger 3 rotates. In the outer side surface 31 d of the flange portion 31 , the groove 33 is formed from the inner peripheral side of the lip contact portion 32 to the outer peripheral side of the lip contact portion 32 . The groove 33 may be formed on the outer side surface 31d of the outer disk portion 31b so as to extend from the inner end to the outer end, and extend along the radial direction of the outer side surface 31d including the lip contact portion 32. It may be formed in a region (peripheral surface) of the width of the portion. Further, the groove 33 may be located on the inner peripheral side of the lip contact portion 32 on the outer side surface 31d of the outer peripheral disk portion 31b. For example, a plurality of grooves 33 are formed on the outer surface 31d of the flange portion 31, and as shown in FIG. These four threaded grooves 33 form a four-start thread. The number of the grooves 33 and the shape drawn by the grooves 33 may be other than the four-start thread. For example, the groove 33 has a shape along a line drawn on a plane perpendicular to the axis of the conical surface when a helical screw groove formed on the conical surface is projected onto the plane.

Also, in the slinger 3, the cylindrical portion 34 has, as shown in FIG. 2, at least partially a cylindrical portion 35 which is a cylindrical or substantially cylindrical portion. It is formed so that it can be worn. That is, the inner diameter of the cylindrical portion 35 is smaller than the diameter of the outer peripheral surface of the shaft so that the cylindrical portion 35 can be tightly fitted to the shaft. The slinger 3 is not limited to being fixed by tightly fitting the cylindrical portion 35 to the shaft, but may be fixed by bonding the cylindrical portion 34 to the shaft, or by other known fixing methods. It may be fixed to the shaft. Note that the tubular portion 34 may be formed entirely by the cylindrical portion 35 .

The slinger 3 is made of a metal material as a base material. For example, SPCC (cold rolled steel) is used as a base material, and the SPCC is coated with a phosphate coating to prevent rust. . Phosphate film treatment includes, for example, zinc phosphate film treatment. The slinger 3 with high rust prevention performance can suppress the occurrence of rust on the lip contact portion 32, which is a sliding portion with respect to the end face lip 21, and the sealing function and sealing performance of the end face lip 21 can be maintained for a long time. can. In addition, it is possible to suppress the change in the shape of the groove 33 due to the generation of rust, thereby suppressing the reduction in the pumping effect exhibited by the groove 33 . As the base material of the slinger 3, other metals such as stainless steel having excellent rust resistance and rust prevention properties may be used. Further, the antirust treatment of the base material of the slinger 3 may be other treatment such as metal plating.

Next, the operation of the sealing device 1 having the configuration described above will be described. FIG. 5 is a partially enlarged cross-sectional view of the sealing device 1 in use, in which the sealing device 1 is attached to a housing 100 to which the sealing device 1 is attached, and a shaft 102 inserted into a shaft hole 101 which is a through hole formed in the housing 100. is. The housing 100 is, for example, an engine front cover or cylinder block and crankcase, and the shaft hole 101 is a crank hole formed in the front cover or cylinder block and crankcase. Also, the shaft 102 is, for example, a crankshaft.

As shown in FIG. 5, when the sealing device 1 is in use, the sealing device main body 2 is press-fitted into the shaft hole 101 and is fitted into the shaft hole 101, and the slinger 3 is tightly fitted to the shaft 102. installed. More specifically, the outer cylindrical portion 11a of the reinforcing ring 10 comes into contact with the inner peripheral surface 101a of the shaft hole 101 to align the shaft center of the sealing device body 2 with the shaft hole 101. The gasket portion 26 of 20 is radially compressed between the inner peripheral surface 101a of the shaft hole 101 and the inner peripheral cylindrical portion 11b of the reinforcing ring 10, so that the gasket portion 26 is in close contact with the inner peripheral surface 101a of the shaft hole 101. Thus, sealing between the sealing device main body 2 and the shaft hole 101 is achieved. The cylindrical portion 35 of the slinger 3 is press-fitted onto the shaft 102 , the inner peripheral surface 35 a of the cylindrical portion 35 is in close contact with the outer peripheral surface 102 a of the shaft 102 , and the slinger 3 is fixed to the shaft 102 .

When the sealing device 1 is in use, the end face lip 21 of the elastic body portion 20 is positioned outside the outer peripheral disk portion 31b of the flange portion 31 of the slinger 3 at the slinger contact portion 22a, which is the portion of the inner peripheral surface 22 on the tip 21a side. The relative position between the sealing device main body 2 and the slinger 3 in the direction of the axis x is determined so as to contact the lip contact portion 32, which is the portion of the side surface 31d. Further, the dust lip 28 is in contact with the cylindrical portion 34 of the slinger 3 from the outer peripheral side at the tip side portion. The dust lip 28 is in contact with the outer peripheral surface 35b of the cylindrical portion 35 of the slinger 3, for example.

Thus, when the sealing device 1 is used, the slinger 3 is in slidable contact with the lip contact portion 32 of the flange portion 31 at the slinger contact portion 22a of the end face lip 21. The lip 21 and the slinger 3 are intended to prevent a sealing object such as lubricating oil from seeping into the inside from the side of the sealing object beyond the slinger contact portion 22a and the lip contact portion 32 . The dust lip 28 is in contact with the tubular portion 34 of the slinger 3 so that the tubular portion 34 can slide, thereby preventing foreign matter from entering from the outside to the inside.

Further, when the sealing device 1 is in use, the groove 33 forming the four-threaded screw formed in the outer disk portion 31b of the flange portion 31 of the slinger 3 provides a pump action when the shaft (slinger 3) rotates. . Rotation of the shaft (slinger 3) causes a pump action to occur in the vicinity of the slinger contact portion 22a and the lip contact portion 32 in the narrow space S between the flange portion 31 and the end face lip 21. As shown in FIG. Due to this pumping action, even if the object to be sealed oozes into the narrow space S from the side of the object to be sealed, the exuded object to be sealed flows from the narrow space S over the slinger contact portion 22a and the lip contact portion 32. It is returned to the sealed object side. In this way, the leakage of the sealed object into the narrow space S is suppressed by the pump action of the groove 33 formed in the flange portion 31 of the slinger 3 .

In the narrow space S, the object to be sealed that has oozed out beyond the area where the pumping action of the groove 33 is generated (hereinafter also referred to as the pump area) is adjacent to the pump area on the inner peripheral side due to the rotation of the shaft. In the region where the slinger 3 rotates, it rotates about the axis x in the direction of rotation and stays in that region (hereinafter also referred to as the "circulation region").

A radial protrusion 23 is formed on the inner peripheral surface 22 of the end face lip 21, and the radial protrusion 23 extends from the outer edge 22b of the slinger contact portion 22a at a distance G to at least partially recirculate. extends into the area. For this reason, the object to be sealed that remains while rotating in the reflux region collides with the radial protrusion 23, or the object to be sealed that remains while rotating in the reflux region runs along the radial protrusion 23 to the outside (inner peripheral side) of the radial protrusion 23. ) to the inner end 23a, which is the inner (peripheral) end, and the object to be sealed remaining in the reflux area is guided to the pump area. The object to be sealed that has been guided to the pump area by the radial projection 23 is pumped back to the side of the object to be sealed.

A circumferential projection 24 is formed on the inner peripheral surface of the end face lip 21, and the circumferential projection 24 extends on the inner peripheral side of the inner end 23a of the radial projection 23. extends in the reflux region. For this reason, the object to be sealed rotating and staying in the reflux area collides with the circumferential projection 24 and is guided to the radial projection 23, is guided to the pump area by the radial projection 23, receives a pumping action, and is on the side of the object to be sealed. returned to In addition, the object to be sealed rotates along the circumferential projection 24, and the circumferential projection 24 guides the object to be sealed so that the object to be sealed stays stably in the reflux region. In addition, the circumferential projection 24 collides with the object to be sealed flowing on the inner peripheral surface 22 of the end face lip 21 from the tip 21a side to the root 21b side, and the inner peripheral surface 22 of the sealing object flows from the tip 21a side to the root 21b side. dam the flow.

FIG. 6 shows how the object to be sealed flows due to the action of the radial projection 23 and the circumferential projection 24 of the end face lip 21, for explaining the action of the radial projection 23 and the circumferential projection 24 of the end face lip 21. FIG. It is a diagram for In FIG. 6, as indicated by the dashed line F1, the object to be sealed that oozes beyond the pump region toward the reflux region collides with the side surface 23c, which is the side surface facing the outer peripheral side of the radial projection 23, and moves toward the pump region. It is either rebounded or guided along the side 23c of the radial projection 23 to the inner end 23a, from which it is returned to the pump area. For this reason, it is preferable that the radial projection 23 is formed so that a portion of the inner end 23a side of the inner peripheral surface 22 of the end face lip 21 enters the pump area. As will be described later, it is considered that the radial width of the pump region changes depending on the rotational speed of the shaft. For this reason, it is preferable that a portion of the radial projection 23 on the inner end 23a side is formed so as to enter the pump region regardless of the rotational speed of the shaft. In addition, when the radial protrusion 23 is formed so as to exist entirely in the return region, the sealing object that has leaked into the return region beyond the pump region can be returned to the pump region as described above. In the range, the distance G from the outer edge 22b of the slinger contact portion 22a is set.

In addition, it does not hit the side surface 23c of the radial projection 23, and even if it hits, it does not rebound and crosses over the side surface 23c, and also crosses the side surface 23c without being guided to the inner end 23a along the side surface 23c. There is also an object to be sealed that goes further to the 21b side. In this way, even if the radial protrusion 23 does not act as described above and the object to be sealed cannot be returned to the pump area again, the object to be sealed further advancing to the root 21b side of the end face lip 21 is , hit the circumferential projection 24 . Therefore, as indicated by the dashed line F2 in FIG. 6, the object to be sealed which advances toward the base 21b without being acted upon by the radial protrusion 23 collides with the outer peripheral surface 24b of the circumferential protrusion 24 and is bounced back to the pump area. Either it is returned to the pump area, or it is guided to the radial projection 23 along the outer peripheral surface 24 b of the circumferential projection 24 , collides with the side surface 23 c of the radial projection 23 and bounces back to the pump area, or the radial projection 23 along side 23c to inner end 23a and from inner end 23a back into the pump area. In addition, as indicated by the dashed line F3 in FIG. 6, the object to be sealed that advances further toward the base 21b without being acted upon by the radial protrusion 23 flows along the outer peripheral surface 24b of the circumferential protrusion 24, and is stably returned to the reflux region. be kept in

In addition, when the slinger 3 is stationary, the object to be sealed that seeps out from the slinger contact portion 22a and the lip contact portion 32 flows down the inner peripheral surface 22 of the end face lip 21 from the tip 21a side to the root 21b side due to its own weight. It collides with the outer peripheral surface 24b of the circumferential projection 24 and is blocked. Therefore, in the stationary state of the slinger 3, that is, in the stationary state of the shaft 102, the circumferential protrusions 24 can prevent the sealed object from leaking out to the outside. In order to prevent leakage of the sealed object to the outside when the slinger 3 is stationary, the outer peripheral surface 24b of the circumferential projection 24 may extend obliquely or bent to the outer peripheral side with respect to the axis x. preferable. This is because an object to be sealed can be easily held between the inner peripheral surface 22 of the end face lip 21 and the outer peripheral surface 24b of the circumferential projection 24. As shown in FIG.

In addition, as described above, since there is an object to be sealed which further advances toward the root 21b side of the end face lip 21, the radial projections 23 adjacent to each other on the rotational direction side of the shaft 102 (slinger 3) and the axis x It is preferable that they are arranged so as to partially overlap when viewed from the inner peripheral side (outside) to the outer peripheral side (inside) in the direction. As shown by the broken line F4 on the left side of FIG. The object to be sealed hits the side surface 23c of the radial projection 23 adjacent on the rotational side of the slinger 3 and either rebounds the object to be sealed or guides the object along the side surface 23c to the inner edge 23a, causing the object to be sealed. This is because it can be returned to the pump area. In addition, the portion of the radial projection 23 that does not overlap with the adjacent radial projection 23 on the side opposite to the rotation direction of the slinger 3 when viewed from the outer peripheral side (inner side) to the inner peripheral side (outer side) in the direction of the axis x is provided with a slinger. The radial protrusions 23 are arranged so that the radial protrusions 23 adjacent on the rotational direction side of 3 partially overlap when viewed from the inner peripheral side (outer side) to the outer peripheral side (inner side) in the direction of the axis x. preferable.

Further, in order to improve the function of returning the sealing object that has passed over the adjacent radial projections 23 to the pump area, the mutually adjacent radial projections 23 overlap when viewed from the inner peripheral side to the outer peripheral side in the direction of the axis x. In order to increase the area, it is preferable to adjust the extending direction (angle) of the radial projections 23 and the interval (pitch) between adjacent radial projections 23 . Moreover, it is preferable that the radial projections 23 are adjacent to each other at equal intervals so that the end face lip 21 has the functions of the radial projections 23 evenly in the circumferential direction.

As described above, in the sealing device 1, even if the object to be sealed oozes beyond the pumping region where the pump action works and into the reflux region, the oozing object to be sealed is removed by the radial projections 23 and the circumferential projections. 24, it can be returned to the pumping area and, by means of the pumping action, to the side of the object to be sealed.

The pumping action based on the grooves 33 of the slinger 3 decreases as the slinger 3 rotates faster. It is considered that this is because the pump area shrinks toward the slinger contact portion 22a and the lip contact portion 32 as the rotation of the slinger 3 increases. Therefore, when the object to be sealed seeps into the narrow space S from the side of the object to be sealed, the faster the rotation of the slinger 3, the more the object to be sealed enters the reflux region. When the amount of the sealing object flowing back through the reflux area exceeds the amount of the sealing object that can be retained in the reflux area, the sealing object will seep further into the interior and out of the sealing device 1 . It can ooze out.

In the sealing device 1 according to the first embodiment of the present invention, as described above, even if an object to be sealed oozes out beyond the pump region into the reflux region, the exuded object to be sealed is removed by diameter. The directional projections 23 and the circumferential projections 24 allow it to be returned to the pumping area and furthermore to the side of the object to be sealed by the pumping action. In addition, the circumferential protrusion 24 can guide the sealing object that seeps into the reflux area beyond the pump area so as to stably stay in the reflux area. Therefore, even if the slinger 3 rotates at a high speed and the number of objects to be sealed remaining in the reflux area increases, the objects to be sealed remaining in the reflux area can be returned to the pump area by the radial protrusions 23 and the circumferential protrusions 24. It is possible to suppress the amount of the sealing object that flows back through the reflux area from exceeding the amount of the sealing object that can be retained in the reflux area. In addition, even if the pump action is reduced due to the high rotation of the slinger 3, the radial projection 23 and the circumferential projection 24 return the object to be sealed to the pump area. The number of objects to be sealed that can be returned to the side can be increased. In addition, since the circumferential protrusion 24 can guide the object to be sealed stably in the reflux region, the amount of the object to be sealed that can be held in the reflux region can be increased, and the height of the slinger 3 can be increased. Even if the pumping action is reduced by the rotation, it is possible to suppress further leakage of the sealed object to the outside.

As described above, according to the sealing device 1 according to the first embodiment of the present invention, even when the pumping action of the grooves 33 of the slinger 3 is utilized, the sealing object can be sealed regardless of the rotational speed of the shaft. It is possible to suppress the exudation of substances.

Next, a sealing device 4 according to a second embodiment of the invention will be described. A sealing device 4 according to the second embodiment of the present invention differs from the above-described sealing device 1 according to the first embodiment of the present invention in the shape of the circumferential projections 24 instead of the circumferential projections 24. It has a circumferential projection 41 at its end. Hereinafter, configurations having the same or similar functions as those of the sealing device 1 according to the first embodiment of the present invention described above are denoted by the same reference numerals, and descriptions thereof are omitted, and different configurations will be described.

FIG. 7 is a diagram corresponding to FIG. 3 described above, and is a partially enlarged perspective view of the elastic body portion 20 in the sealing device 4. The elastic body portion 20 in the portion on the inner peripheral side from the base portion 25 extends along the axis x. It is shown cut in plane. In the sealing device 4, the circumferential projection 41 extends around the axis x outside (inner peripheral side) than the inner end 23a of the radial projection 23, similarly to the circumferential projection 24 of the sealing device 1 described above, It protrudes from the end face lip 21 outside the slinger contact portion 22a in the direction of the axis line x.

Specifically, on the inner peripheral surface 22 of the end face lip 21, the circumferential projections 41 are provided on the same or substantially the same circumference around the axis x. As described above, the circumferential projection 41 extends around the axis x outside the inner end 23a of the radial projection 23 (on the root 21b side of the end face lip 21), for example, from the pump region of the sealing device 4. are also provided on the outer side (or on the inner peripheral side).

In addition, like the above-described circumferential projection 24 (see FIGS. 1 and 2), the circumferential projection 41 projects from the end face lip 21 in a region outside the slinger contact portion 22a in the direction of the axis x. A tip 41a, which is an inner end of the directional projection 41, is located outside the slinger contact portion 22a in the direction of the axis x. In this way, the circumferential projection 41 is shaped so as not to come into contact with the slinger 3 when the sealing device 4 is in use, and the circumferential projection 41 does not increase sliding resistance to the slinger 3 .

Moreover, the circumferential projection 41 protrudes further inward than the radial projection 23 in the direction of the axis x, like the circumferential projection 24 (see FIG. 2). The circumferential projection 41 does not have to protrude further inward than the radial projection 23 in the direction of the axis x, and the amount of projection of the circumferential projection 41 in the direction of the axis x is It may be the same as the protrusion amount. Moreover, the shape of the cross section (see FIG. 2) perpendicular to the extending direction of the circumferential projection 41 is not limited to a rectangle, and may be various shapes such as a triangle, a square, and an inverted U shape. The outer peripheral surface 41b, which is the surface facing the outer peripheral side of the circumferential projection 41, is preferably a surface facing the outer peripheral side at least when the sealing device 4 is in use, and is a surface extending along the axis x. Alternatively, it is preferably a surface that extends obliquely to the outer peripheral side with respect to the axis x that is inclined to the inner peripheral surface 22 side.

The circumferential projection 41 has a gap 42 between the side surface 23c of at least one radial projection 23 and the side surface 23c facing away from the rotational direction of the slinger 3, as shown in FIG. The gap 42 is a gap extending in the circumferential direction and is formed in part of the width between the radial projections 23 adjacent to each other. In other words, in at least one of the spaces between the radial projections 23 adjacent to each other, the radial projection 23 extends from the side surface 23c of the radial projection 23 on the rotational direction side of the slinger 3 to a partial range on the side opposite to the rotational direction of the slinger 3. The directional projection 41 is discontinued, and a gap 42 is formed in the circumferential projection 41 at this discontinued portion. The gaps 42 may be formed in a plurality of spaces between adjacent radial projections 23, and in the illustrated embodiment the gaps 42 are formed in all of the spaces between adjacent radial projections 23. formed.

Next, the action of the sealing device 4 having the above configuration will be described. 8A and 8B are diagrams for showing how the sealing object flows due to the action of the radial projection 23 and the circumferential projection 41 of the end face lip 21. FIG. In the sealing device 4, as shown in FIG. 8, similarly to the above-described sealing device 1, the radial projections 23 act on the oozing sealed object (broken lines F1, F4), and the circumferential projections 41 act on the above-described sealing object. It acts on the exuding sealing object in the same way as the circumferential projection 24 of the sealing device 1 (broken lines F2, F3). The circumferential projection 41 also acts as a weir in the stationary state of the shaft 52 in the same manner as the circumferential projection 24 of the sealing device 1 described above.

Further, as shown in FIG. 8, even if the object to be sealed moves further toward the inner peripheral side beyond the circumferential projection 41, if the object to be sealed collides with the radial projection 23, the object to be sealed will is bounced toward the pump area or guided toward the inner peripheral end 23 a along the side surface 23 c of the radial projection 23 and reaches the circumferential projection 41 . In the sealing device 4 according to the present embodiment, since the circumferential projections 41 have the gaps 42 , the object to be sealed or the radial projections 23 bounced off the radial projections 23 over the circumferential projections 41 . The object to be sealed, which has been guided toward the inner peripheral end 23a along the side surface 23c, can be returned to the pump region side of the circumferential protrusion 41 through the gap 42 (broken line F5). As described above, the radial projections 23 and the circumferential projections 42 act on the object to be sealed that has returned to the pump area side of the circumferential projection 41 through the gap 42 so that it can be returned to the pump area. . As described above, in the sealing device 4, even the sealing object that has leaked over the circumferential projection 41 can be returned to the pump area, and the leakage of the sealing object to the outside can be further suppressed.

As described above, according to the sealing device 4 according to the second embodiment of the present invention, even when the pumping action of the grooves 33 of the slinger 3 is utilized, the sealing object is sealed regardless of the rotational speed of the shaft. It is possible to suppress the exudation of substances.

A sealing device 5 according to a third embodiment of the present invention will be described below with reference to the drawings.

A sealing device 5 according to the third embodiment of the present invention differs from the above-described sealing device 1 according to the first embodiment of the present invention in the form of the elastic body portion. Hereinafter, configurations having the same or similar functions as those of the sealing device 1 according to the first embodiment of the present invention described above are denoted by the same reference numerals, and descriptions thereof are omitted, and different portions will be described. .

FIG. 9 is a cross-sectional view along the axis x for showing the schematic configuration of the sealing device 5 according to the third embodiment of the present invention. FIG. 10 is a cross-sectional view of the sealing device 5 along the axis x. It is a partial expanded sectional view which expands and shows a part. A sealing device 5 according to the present embodiment is a sealing device for sealing an annular gap between a shaft and a hole into which the shaft is inserted, like the sealing device 1 described above.

As shown in FIGS. 9 and 10 , the sealing device 5 includes a sealing device body 50 corresponding to the sealing device body 2 of the sealing device 1 described above, and a slinger 3 . The sealing device main body 50 includes a reinforcing ring 10 and an elastic body portion 51 formed of an elastic body attached to the reinforcing ring 10 and having an annular shape around the axis x. The elastic body portion 51 has a radial projection 52 different in shape from the elastic body portion 20 of the sealing device 1 described above, and different from the radial projection 23 of the elastic body portion 20 described above. Circumferential projections 53 and 54 are different from the circumferential projection 24 of the elastic body portion 20 described above.

In the elastic body portion 51 , a plurality of radial projections 52 are formed along the circumferential direction on the inner peripheral surface 22 of the end face lip 21 , as shown in FIG. 11 . Similar to the radial projection 23, the radial projection 52 spirally extends from the outside toward the inside in the rotational direction of the shaft 102 (slinger 3), and the slinger contact portion 22a at the end face lip 21. formed on the inner peripheral side of the

As shown in FIGS. 11 and 12, on the inner peripheral surface 22 of the end face lip 21, a plurality of radial projections 52 are formed on the same or substantially the same circumference at equiangular or substantially equiangular intervals in the circumferential direction. are arranged at equal pitch intervals or approximately equal pitch intervals. As described above, each radial projection 52 spirally extends from the outer side (lower side in FIGS. 11 and 12) to the inner side (upper side in FIGS. 11 and 12) in the rotational direction of the shaft 102 (slinger 3). there is That is, each radial projection 52 extends obliquely in the rotation direction of the slinger 3 from the root 21b side of the end face lip 21 toward the tip 21a side. Each radial projection 52 is spaced apart from the slinger contact portion 22a, and is formed on the inner peripheral side (outer side) than the slinger contact portion 22a, that is, on the root 21b side of the end face lip 21. there is

In the end face lip 21, the radial projection 52 is formed at a distance from the slinger contact portion 22a, similarly to the radial projection 23 described above, and is the inner (peripheral) end of the radial projection 52. The inner end 52a is positioned at a predetermined distance G from the outer edge 22b of the slinger contact portion 22a in the direction along the axis x along the inner peripheral surface 22 (see FIG. 3). The radial projection 52 extends along the inner peripheral surface 22 of the end face lip 21 to a circumferential projection 54, which will be described later. , are connected to an outer peripheral surface 54b of a circumferential projection 54, which will be described later.

Further, as will be described later, each radial protrusion 52 is formed in a shape that does not come into contact with the slinger 3 when the sealing device 5 is in use, similarly to the radial protrusion 23 of the sealing device 1 described above. That is, the height of the radial protrusion 52 from the inner peripheral surface 22 and the distance G are set so that the radial protrusion 52 does not contact the outer surface 31d of the flange portion 31 of the slinger 3 in use. In this embodiment, as shown in FIGS. 10 and 12, the radial protrusion 52 increases in height from the inner peripheral surface 22 from the inner end 52a toward the outer end 52b. Further, the radial projection 52 extends over part of the entire width in the direction of the axis x of the outer peripheral surface 54b of the circumferential projection 54 at the outer end 52b. The radial protrusion 52 may extend to the intermediate lip 29 , and the outer end 52 b of the radial protrusion 52 may be connected to the outer peripheral surface 29 a of the intermediate lip 29 , which is the outer peripheral surface of the intermediate lip 29 . It may extend to a position between the circumferential protrusions 54 .

As described above, the radial protrusion 52 is formed in the shape of a rib on the inner peripheral surface 22 of the end face lip 21 from the position spaced apart from the outer edge 22b of the slinger contact portion 22a toward the inner peripheral side by the distance G. The side surfaces 52c and 52d, which are surfaces facing the direction, extend orthogonally or substantially orthogonally to the inner peripheral surface 22 of the end lip 21. As shown in FIG. The side surfaces 52c and 52d may not be perpendicular to the inner peripheral surface 22 and may extend with an inclination. For example, the side surface 52c may be inclined toward the inner peripheral surface 22 side. The side surface 52c and the side surface 52d extend parallel or substantially parallel to each other, and the end surface 52e forming the surface of the radial projection 52 on the slinger 3 side extends planarly or substantially planarly. As shown in FIG. 12, the end face 52e has a shape on the inner end 52a side so as to be smoothly connected to the inner peripheral surface 22 of the end face lip 21 at the inner end 52a. For example, the end surface 52e is bent or curved at the portion on the inner end 52a side from the other portion.

The height of the radial projection 52 from the inner peripheral surface 22 is not limited to the specific shape described above. The radial projections 52 may be of a constant height from the inner peripheral surface 22 from the inner end 52a to the outer end 52b, with the height from the inner peripheral surface 22 increasing from the inner end 52a to the outer end 52b. It may be low. Moreover, the radial protrusion 52 may have various combinations of the above-described increasing, decreasing, and constant heights from the inner peripheral surface 22 from the inner end 52a to the outer end 52b. Moreover, the shape of the cross section perpendicular to the extending direction of the radial projection 52 is not limited to a rectangle, and may be various shapes such as a triangle, a square, and an inverted U shape. Since the radial protrusions 52 are shaped so as not to come into contact with the slinger 3 when the sealing device 5 is in use, the radial protrusions 52 do not increase the sliding resistance to the slinger 3 .

Further, the shape of the radial projection 52 in the extending direction may be tapered from the outer end 52b toward the inner end 52a, similar to the radial projection 23 described above (see FIG. 3). It may have a shape in which the width in the direction orthogonal to the extending direction changes along the extending direction between 52b and the inner end 52a, or various shapes. Also, the radial protrusion 52 may extend straight between the inner end 52a and the outer end 52b, or may extend curvedly.

At least one circumferential projection is provided on the inner peripheral surface 22 of the end face lip 21 on the same or substantially the same circumference centered on or substantially centered on the axis x. In the sealing device 5 according to the present embodiment, as shown in FIGS. 9 to 12, two circumferential projections 53 and 54 are provided on the end face lip 21 as circumferential projections.

10 and 12, the circumferential projection 53 extends around the axis x outside the inner end 52a of the radial projection 52 (on the side of the outer end 52b), similarly to the circumferential projection 24 described above. there is In the present embodiment, the circumferential projection 53 is provided on the inner peripheral side of the pump area of the sealing device 5 . The circumferential protrusions 53 are preferably provided in the reflux region.

10 and 12, the circumferential projection 53 protrudes from the end face lip 21 in a region outside the slinger contact portion 22a in the direction of the axis x, and the inner end portion of the circumferential projection 53 is located outside the slinger contact portion 22a in the direction of the axis x. As described above, the circumferential projection 53 is shaped so as not to come into contact with the slinger 3 when the sealing device 5 is in use.

10 and 12, the circumferential projection 53 protrudes further inward than the radial projection 52 in the direction of the axis x. The circumferential projection 53 does not have to protrude further inward than the radial projection 52 in the axis x direction. It may be the same as the amount. Moreover, the shape of the cross section (see FIG. 10) perpendicular to the extending direction of the circumferential projection 53 is not limited to a rectangle, and may be various shapes such as a triangle, a square, and an inverted U shape.

The outer peripheral surface 53b, which is the surface facing the outer peripheral side of the circumferential projection 53, preferably extends along the axis x at least when the sealing device 5 is in use, or is inclined toward the inner peripheral surface 22. It is preferable that the surface extends obliquely to the outer peripheral side with respect to the axis x. In other words, the outer peripheral surface 53b of the circumferential projection 53 preferably has a conical surface shape or a substantially conical surface shape that expands inward in the direction of the axis x.

As shown in FIGS. 10 and 12, the circumferential projection 54 extends around the axis x on the outer side or the inner circumferential side (the root 21b side of the end face lip 21) of the circumferential projection 53. As shown in FIGS. 10 and 12, the circumferential projection 54 protrudes from the end face lip 21 in a region outside the slinger contact portion 22a in the direction of the axis x, and the inner end portion of the circumferential projection 54 is located outside the slinger contact portion 22a in the direction of the axis x. As described above, the circumferential projection 54 is formed in such a shape that it does not come into contact with the slinger 3 when the sealing device 5 is used.

10 and 12, the circumferential projection 54 protrudes further inward than the radial projection 52 in the direction of the axis x. The circumferential projection 54 does not have to protrude inward in the direction of the axis x more than the radial projection 52, and the amount of projection of the circumferential projection 54 in the direction of the axis x is the same as the projection of the radial projection 52 in the direction of the axis x. It may be the same as the amount. Moreover, the shape of the cross section (see FIG. 10) perpendicular to the extending direction of the circumferential projection 54 is not limited to a rectangle, and may be various shapes such as a triangle, a square, and an inverted U shape.

The outer peripheral surface 54b, which is the surface facing the outer peripheral side of the circumferential projection 54, preferably extends along the axis x at least when the sealing device 5 is in use, or is inclined toward the inner peripheral surface 22. It is preferable that the surface extends obliquely to the outer peripheral side with respect to the axis x. That is, the outer peripheral surface 54b of the circumferential projection 54 preferably has a conical surface shape or a substantially conical surface shape that expands inward in the direction of the axis x.

As described above, the radial projections 52 extend inwardly to the circumferential projections 54 and the outer ends 52b of the radial projections 52 are connected to the outer peripheral surface 54b of the circumferential projections 54 . The circumferential projection 54 is formed, for example, at a position (range) in which the tip 54a faces the outer disk portion 31b in the radial direction.

Next, the action of the sealing device 5 having the above configuration will be described. The radial protrusions 52 act on the exuding sealing object in the same manner as the radial protrusions 23 in the sealing device 1 described above (see dashed lines F1 and F4 in FIG. 6). Moreover, the circumferential projections 53 act in the same manner as the circumferential projections 24 in the sealing device 1 described above (F2, F3 in FIG. 6). In addition, the circumferential projections 54 on the inner peripheral side act on the sealing object that has leaked out beyond the circumferential projections 53 on the outer peripheral side. Specifically, the circumferential projections 54 further collide with the leaked sealing object and bounce the sealing object back toward the inner circumference. When the rebounded portion to be sealed reaches the radial projection 52 inside the circumferential projection 53, the radial projection 52 can return the sealed object to the pump area by the action of the side surface 52c. Thus, the circumferential projections 54 have the function of assisting the function of the radial projections 52 to return the sealed object to the pump area.

In addition, the circumferential projection 54 can stably retain the object to be sealed in the reflux area, similarly to the circumferential projection 53 on the inner peripheral side, and also, when the slinger 3 is stationary, the end face lip 21 is pulled by its own weight. It is possible to dam the object to be sealed that flows down from the tip 21a side to the root 21b side of the inner peripheral surface 22 of.

As described above, in the sealing device 5 according to the third embodiment of the present invention, the radial protrusion 52 and the circumferential protrusions 53 and 54 cause sealing leaks beyond the slinger contact portion 22 a and the lip contact portion 32 . Objects can be returned to the pump area, and even when the shaft 102 rotates at a high speed when the pump area narrows, many sealed objects can be held in the reflux area by the circumferential protrusions 53 and 54 and returned to the pump area. It is possible to increase the amount of sealed objects that are to be sealed. In addition, the circumferential protrusions 53 and 54 can prevent the sealed object from leaking toward the intermediate lip 28 when the shaft 102 is stationary.

As described above, according to the sealing device 5 according to the third embodiment of the present invention, even when the pumping action of the grooves 33 of the slinger 3 is utilized, the sealing target is not affected by the rotational speed of the shaft. It is possible to suppress the exudation of substances.

Next, modified examples of the sealing devices 1, 4 and 5 according to the embodiments of the present invention will be described.

FIG. 14 shows a modification of the sealing device 1 according to the first embodiment of the invention, and FIG. 15 shows a modification of the sealing device 4 according to the second embodiment of the invention. It is a diagram. The end face lip 21 of the sealing devices 1,4 may have a plurality of circumferential lips, for example, as shown in FIGS. In addition, the sealing device 5 may further have a circumferential projection 54 that the end face lip 21 has.

FIG. 16 shows a modification of the sealing device 5 according to the third embodiment of the present invention. As shown in FIG. Similar to the projections 41 , there may be a gap 42 between the side 52 c of the at least one radial projection 52 facing away from the direction of rotation of the slinger 3 . In the variant shown in FIG. 16, gaps 42 are formed in all the spaces between adjacent radial projections 52 .

Further, although the radial projections 23 and 52 are described as extending spirally, they extend to form various shapes on the inner peripheral surface 22 of the end lip 21, and the inner peripheral surface 22 of the end lip 21 extends to form various shapes. It may be arranged spirally on the top. Further, the side surfaces 23c, 23d and the side surfaces 52c, 52d of the projections 23, 52 may be planar or curved.

The groove 33 of the slinger 3 is not limited to the screw (four-start screw) shape shown in FIG. 4 as described above, and may have another shape. For example, as shown in FIG. 17(a), grooves extending radially from the inner peripheral side to the outer peripheral side with the axis x as the center or approximately the center may be used, or as shown in FIG. 17(b). , grooves extending obliquely in the circumferential direction.

In the sealing devices 1, 4 and 5, the elastic parts 20 and 51 have the dust lip 28 and the intermediate lip 29, but the elastic parts 20 and 51 have the dust lip 28 and the intermediate lip 29. Either the dust lip 28 or the intermediate lip 29 may be provided.

Further, although the sealing devices 1, 4, and 5 according to the present embodiment are applied to the crankhole of the engine, the application target of the sealing device according to the present invention is not limited to this. The present invention is applicable to all configurations that can utilize the effects of the present invention, such as vehicles, general-purpose machines, and industrial machines.

1, 4, 5 sealing device 2, 50 sealing device main body 3 slinger 10 reinforcing ring 11 cylindrical portion 11a outer cylindrical portion 11b inner cylindrical portion 11c connecting portions 12, 14 disk portion 13 conical ring portions 20, 51 elastic body portion 21 end face lip 21a tip 21b root 22 inner peripheral surface 22a slinger contact portion 22b outer edges 23, 52 radial projections 23a, 52a inner ends 23b, 52b outer ends 23c, 23d, 52c, 52d side surfaces 24, 41, 53, 54 circumference Directional protrusions 24a, 41a, 53a, 54a Tip ends 24b, 41b, 53b, 54b Outer peripheral surface 25 Base portion 26 Gasket portion 27 Rear cover portion 28 Dust lip 29 Intermediate lip 29a Outer peripheral surface 31 Flange portion 31a Inner peripheral disk portion 31b Outer peripheral side Disc portion 31c Connection portion 31d Outer surface 32 Lip contact portion 33 Groove 34 Cylindrical portion 35 Cylindrical portion 35a Inner peripheral surface 35b Outer peripheral surface 42 Gap 52e End surface 100 Housing 101 Shaft hole 101a Inner peripheral surface 102 Shaft 102a Outer peripheral surface G Gap S Narrow space x-axis

Claims (3)

A sealing device for sealing an annular gap between a shaft and a hole into which the shaft is inserted,
a sealing device body fitted into the hole;
a slinger attached to the shaft;
The sealing device main body has an annular reinforcing ring around an axis, and an annular elastic body part formed from an elastic body attached to the reinforcing ring and annular around the axis,
The slinger has a flange portion which is an annular portion around the axis extending toward the outer peripheral side,
The elastic body portion has an end face lip extending toward one side in the axial direction and being an annular lip around the axis that contacts the flange portion from the other side in the axial direction,
at least one groove is formed in the other side of the flange portion of the slinger;
A plurality of radial projections are formed in a circumferential direction on the inner peripheral surface of the end face lip, and at least one circumferential projection is formed,
The radial protrusion spirally extends in the rotational direction of the shaft from the other side toward the one side, and the slinger contact portion is a portion of the end face lip where the end face lip contacts the slinger. It is formed on the inner peripheral side than
The circumferential projection extends around the axis on the other side of the one-side end of the radial projection, and extends on the other side in the axial direction of the slinger contact portion. protruding from the end face lip at
The circumferential projection is discontinued in a part of the range on the side opposite to the rotational direction of the slinger from the side surface of the radial projection on the rotational direction side of the slinger. A sealing device characterized in that an extending gap is formed as the gap . A sealing device for sealing an annular gap between a shaft and a hole into which the shaft is inserted,
a sealing device body fitted into the hole;
a slinger attached to the shaft;
The sealing device main body has an annular reinforcing ring around an axis, and an annular elastic body part formed from an elastic body attached to the reinforcing ring and annular around the axis,
The slinger has a flange portion which is an annular portion around the axis extending toward the outer peripheral side,
The elastic body portion has an end face lip extending toward one side in the axial direction and being an annular lip around the axis and contacting the flange portion from the other side in the axial direction,
at least one groove is formed in the other side of the flange portion of the slinger;
A plurality of radial projections are formed in a circumferential direction on the inner peripheral surface of the end face lip, and at least one circumferential projection is formed,
The radial protrusion spirally extends in the direction of rotation of the shaft from the other side toward the one side, and the slinger contact portion is a portion of the end face lip where the end face lip contacts the slinger. It is formed on the inner peripheral side than
The circumferential projection extends around the axis on the other side of the one-side end of the radial projection, and extends on the other side in the axial direction of the slinger contact portion. protruding from the end face lip at
A sealing device, wherein the circumferential projection is provided on the other side of the pump area of the sealing device and is formed in a shape that does not come into contact with the slinger. A sealing device for sealing an annular gap between a shaft and a hole into which the shaft is inserted,
a sealing device body fitted into the hole;
a slinger attached to the shaft;
The sealing device main body has an annular reinforcing ring around an axis, and an annular elastic body part formed from an elastic body attached to the reinforcing ring and annular around the axis,
The slinger has a flange portion which is an annular portion around the axis extending toward the outer peripheral side,
The elastic body portion has an end face lip extending toward one side in the axial direction and being an annular lip around the axis that contacts the flange portion from the other side in the axial direction,
at least one groove is formed in the other side of the flange portion of the slinger;
A plurality of radial projections are formed in a circumferential direction on the inner peripheral surface of the end face lip, and at least one circumferential projection is formed,
The radial protrusion spirally extends in the rotational direction of the shaft from the other side toward the one side, and the slinger contact portion is a portion of the end face lip where the end face lip contacts the slinger. It is formed on the inner peripheral side than
A sealing device, wherein the radial projection is formed on the end face lip at a distance from the slinger contact portion.

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